[2018-Vol.15-Issue 4]Effect of Feather Elasticity of Kingfisher Wing on Droplet Impact Dynamics
Time: 2018-09-03 16:06  Click:269
Journal of Bionic Engineering
Volume 15, Issue 3, May 2018, Pages 731-740.
Chengchun Zhang1,2, Zhengyang Wu1, Xiumei Zhang1, Yongli Yue1, Jing Wang1,3*
1. Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130022, China
2. State Key Laboratory of Automotive Simulation and Control, Jilin University, Changchun 130022, China
3. College of Physics, Jilin University, Changchun 130012, China
Abstract  We experimentally studied droplet impact dynamics onto wing feathers of kingfishers. Distilled water droplets with a fixed diameter of 2.06 mm were used as drop liquid and the initial impact velocities of droplets varied from 0.28 m•s−1 to 1.60 m•s−1. Two high-speed cameras were utilized to capture the impact process of water droplets onto the wing feather surface from both horizontal and vertical directions. Two states of the feathers (elastic and inelastic) were considered to study the influence of elasticity. At the entire impact ve-locity range we studied, regular rebound, bubble trapping and jetting, partial pinning and partial rebound of droplets on inelastic wing feather surface were observed as the initial impact velocity increased. However, only one dynamic behavior (regular rebound) was found on the elastic wing feather surface. The elasticity plays a more important role in the direction difference of droplet spreading than wing feather microstructure. The contact time of water droplets on the elastic wing feather surface was less than that on the inelastic surface within the range of Web numbers from 1.06 to 36 under test conditions.
Key words: bionic      droplet impact      kingfisher feather      elasticity      contact time      spreading behavior  
Full text is available at :https://link.springer.com/article/10.1007/s42235-018-0061-5
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